My table of Integrals has the general case ##int frac dx x^two+a^two ## as being a 'standard' integral also, not simply the situation where by ##a=1##. But I think this being a Calculus research challenge it is expected in the OP to determine how to make it happen. Hints got https://gabletoppak.com/bioplastics-greenwashing-or-genuine-solution-the-truth-behind-the-hype/